When zinc metal is treated with a dilute solution of a strong acid, a gas is evolved, which is utilised in the hydrogenation of oil. Name the gas evolved. Write the chemical equation of the reaction involved and also write a test to detect the gas formed.

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Solution

When zinc reacts with dilute solution of strong acid (like hydrochloric acid), it forms salt and hydrogen gas is evolved which is used in hydrogenation of oil.

$Zn + 2HCl dil. hydrochloric acid ⟶ {ZnCl}_{2} Zinc chloride + H_{2} ↑$

To test the presence of $H_{2}$ gas when a burning splinter is brought near the mouth of the test tube, the gas burns with a pop sound.

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